Enhance ZDR Overview with image and reference link

Added an image and a link to the ZDR overview.

Author: brown9804

0_Azure/3_AzureAI/9_AzureOpenAI/demos/12_ZDR_Overview.md

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+# Zero Data Retention on Azure Open AI - Overview 
+
+[![GitHub](https://img.shields.io/badge/--181717?logo=github&logoColor=ffffff)](https://github.com/)
+[brown9804](https://github.com/brown9804)
+
+Last updated: 2025-07-17
+
+------------------------------------------
+
+<details>
+<summary><b>List of References </b> (Click to expand)</summary>
+
+- [Data, privacy, and security for Azure Direct Models in Microsoft Foundry](https://learn.microsoft.com/en-us/azure/ai-foundry/responsible-ai/openai/data-privacy?view=foundry-classic&tabs=azure-portal#how-can-a-customer-verify-if-data-storage-for-abuse-monitoring-is-off)
+
+</details>
+
+
+> ZDR - Microsoft is committed to not retaining any customer requests or response data beyond what is strictly necessary for real-time processing. Once the data has fulfilled its intended purpose, it is promptly deleted, ensuring that prompts and completions are not stored for training, debugging, or analytics purposes.
+
+
+<img width="943" height="1052" alt="flow-3" src="https://github.com/user-attachments/assets/efe3ce83-75f5-4567-8ab3-384bb61fff36" />
+
+
+From [How does Foundry process data to provide Azure Direct Models?](https://learn.microsoft.com/en-us/azure/ai-foundry/responsible-ai/openai/data-privacy?view=foundry-classic&tabs=azure-portal#how-does-foundry-process-data-to-provide-azure-direct-models)
+
+
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+  <p>Refresh Date: 2025-10-23</p>
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